don't you have anything to say at this point in your own defense? landau may have been the maestro of his craft, but there have been others thieves. two summers ago, prosecutors put leslie waffen behind bars. he was in charge of the archives' audio and film records department. he stole thousands of original recordings and sold them on ebay, gems like this eyewitness account of the hindenburg disaster. >> it's a terrific crash, ladies and gentlemen. the smoke and the flames. oh, the humanity! >> simon: another employee stole most of the presidential pardons from the philadelphia archives, as well as hundreds of photos taken by astronauts in space and on the moon. do you look on ebay for suspicious documents? >> brachfeld: that would be one of the sites we would look at. many times, when a thief is trying to move a document on the internet, the buyer may be a federal agent. and that's real sweet. >> simon: you're talking sting operations? >> brachfeld: yes. >> simon: have you been successful with sting operations? >> brachfeld: yes. we ask our sentine